[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | /** |
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| 7 | * @requires OpenLayers/Control.js |
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| 8 | * @requires OpenLayers/Handler/Box.js |
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| 9 | */ |
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| 10 | |
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| 11 | /** |
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| 12 | * Class: OpenLayers.Control.ZoomBox |
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| 13 | * The ZoomBox control enables zooming directly to a given extent, by drawing |
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| 14 | * a box on the map. The box is drawn by holding down shift, whilst dragging |
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| 15 | * the mouse. |
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| 16 | * |
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| 17 | * Inherits from: |
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| 18 | * - <OpenLayers.Control> |
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| 19 | */ |
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| 20 | OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, { |
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| 21 | /** |
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| 22 | * Property: type |
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| 23 | * {OpenLayers.Control.TYPE} |
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| 24 | */ |
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| 25 | type: OpenLayers.Control.TYPE_TOOL, |
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| 26 | |
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| 27 | /** |
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| 28 | * Property: out |
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| 29 | * {Boolean} Should the control be used for zooming out? |
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| 30 | */ |
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| 31 | out: false, |
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| 32 | |
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| 33 | /** |
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| 34 | * Property: alwaysZoom |
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| 35 | * {Boolean} Always zoom in/out, when box drawed |
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| 36 | */ |
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| 37 | alwaysZoom: false, |
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| 38 | |
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| 39 | /** |
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| 40 | * Method: draw |
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| 41 | */ |
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| 42 | draw: function() { |
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| 43 | this.handler = new OpenLayers.Handler.Box( this, |
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| 44 | {done: this.zoomBox}, {keyMask: this.keyMask} ); |
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| 45 | }, |
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| 46 | |
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| 47 | /** |
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| 48 | * Method: zoomBox |
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| 49 | * |
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| 50 | * Parameters: |
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| 51 | * position - {<OpenLayers.Bounds>} or {<OpenLayers.Pixel>} |
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| 52 | */ |
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| 53 | zoomBox: function (position) { |
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| 54 | if (position instanceof OpenLayers.Bounds) { |
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| 55 | var bounds; |
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| 56 | if (!this.out) { |
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| 57 | var minXY = this.map.getLonLatFromPixel( |
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| 58 | new OpenLayers.Pixel(position.left, position.bottom)); |
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| 59 | var maxXY = this.map.getLonLatFromPixel( |
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| 60 | new OpenLayers.Pixel(position.right, position.top)); |
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| 61 | bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat, |
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| 62 | maxXY.lon, maxXY.lat); |
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| 63 | } else { |
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| 64 | var pixWidth = Math.abs(position.right-position.left); |
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| 65 | var pixHeight = Math.abs(position.top-position.bottom); |
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| 66 | var zoomFactor = Math.min((this.map.size.h / pixHeight), |
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| 67 | (this.map.size.w / pixWidth)); |
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| 68 | var extent = this.map.getExtent(); |
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| 69 | var center = this.map.getLonLatFromPixel( |
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| 70 | position.getCenterPixel()); |
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| 71 | var xmin = center.lon - (extent.getWidth()/2)*zoomFactor; |
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| 72 | var xmax = center.lon + (extent.getWidth()/2)*zoomFactor; |
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| 73 | var ymin = center.lat - (extent.getHeight()/2)*zoomFactor; |
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| 74 | var ymax = center.lat + (extent.getHeight()/2)*zoomFactor; |
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| 75 | bounds = new OpenLayers.Bounds(xmin, ymin, xmax, ymax); |
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| 76 | } |
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| 77 | // always zoom in/out |
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| 78 | var lastZoom = this.map.getZoom(); |
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| 79 | this.map.zoomToExtent(bounds); |
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| 80 | if (lastZoom == this.map.getZoom() && this.alwaysZoom == true){ |
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| 81 | this.map.zoomTo(lastZoom + (this.out ? -1 : 1)); |
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| 82 | } |
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| 83 | } else { // it's a pixel |
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| 84 | if (!this.out) { |
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| 85 | this.map.setCenter(this.map.getLonLatFromPixel(position), |
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| 86 | this.map.getZoom() + 1); |
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| 87 | } else { |
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| 88 | this.map.setCenter(this.map.getLonLatFromPixel(position), |
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| 89 | this.map.getZoom() - 1); |
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| 90 | } |
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| 91 | } |
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| 92 | }, |
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| 93 | |
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| 94 | CLASS_NAME: "OpenLayers.Control.ZoomBox" |
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| 95 | }); |
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